1. Configure your firewall
This part of the setup is based on following assumption:
- you've only one wordwide IP address and
- your VE has a private IP address.

It is assumed that your VE can connect to the internet, as only the special setup for the bittorrent ports is shown. The following iptables code will redirect the required ports to your VE, where xxx.xxx.xxx.xxx is the IP of your VE.

iptables -t nat -A PREROUTING -i ppp0 -p tcp --dport 63963:63981 -j DNAT --to-destination xxx.xxx.xxx.xxx
iptables -A FORWARD -d xxx.xxx.xxx.xxx -p tcp --dport 63963:63981 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -t nat -A PREROUTING -i ppp0 -p tcp --dport 63982 -j DNAT --to-destination xxx.xxx.xxx.xxx
iptables -A FORWARD -d xxx.xxx.xxx.xxx -p tcp --dport 63982 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -t nat -A PREROUTING -i ppp0 -p udp --dport 63982 -j DNAT --to-destination xxx.xxx.xxx.xxx
iptables -A FORWARD -d xxx.xxx.xxx.xxx -p udp --dport 63982 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT

2. Install the base and rtorrent
At first the packages we need: (As more packages we can use the less work we'll have)

apt-get install rtorrent screen mc wget lighttpd gawk php5-cgi php5-common php5-sqlite php5-xmlrpc sqlite unzip php5-curl

Now download following file and save it as /etc/init.d/rtorrent in your VE and activated for automatic startup at boot time with

update-rc.d rtorrent defaults 25

After this we need to add a user under which the rtorrrent process runs and

# adduser --disabled-login rt
# usermod -aG tty rt
# su - rt
$ wget http://robert.penz.name/wp-content/uploads/2008/08/rtorrent.rc -O .rtorrent.rc
$ mkdir /home/rt/session
$ logout


change the /home/rt/.rtorrent.rc file to your needs. You should try out rtrorrent after any config file change, to avoid problems with syntax errors or that stuff.

# su - rt
$ rtorrent

If it started press CTRL-Q to get out.

$ logout

If all worked start it with /etc/init.d/rtorrent start

3. lighttpd setup
This sections shows how to setup lighttpd for rtorrent XML RPC and for wtorrent. Add "mod_scgi" to the server.modules in /etc/lighttpd/lighttpd.conf and add following there too:

url.access-deny = ("~", ".inc", ".db", ".tpl.php", ".cls.php",)

Create following file /etc/lighttpd/conf-available/10-scgi.conf with following content:

scgi.server = (
"/RPC2" => # RT_DIR
( "127.0.0.1" =>
(
"host" => "127.0.0.1", # Ip where rtorrent is listening
"port" => 5000, # Port specified in .rtorrent.rc
"check-local" => "disable"
)
)
)

Enable following two configs by setting a symlink:

# cd /etc/lighttpd/conf-enabled/
# ln -s ../conf-available/10-cgi.conf .
# ln -s ../conf-available/10-scgi.conf .

Restart lighttpd:

/etc/init.d/lighttpd restart


4. Install wtorrent
Get the newest version and configure it:

# cd /var/www/
# rm index.lighttpd.html
# wget "http://www.wtorrent-project.org/trac/changeset/latest/trunk/?old_path=%2F&format=zip" -O wtorrent.zip
#unzip wtorrent.zip
#mv trunk/wtorrent/* .
#rm -rf trunk
#mkdir tpl_c/
#cd conf
# cp sample.user.conf.php user.conf.php

Change this file according your settings, especially these lines:

define( 'DIR_TORRENTS', 'torrents/');
define( 'DIR_EXEC', '/var/www/');
define( 'DIR_DOWNLOAD', '/home/rt/doing');

After this makes everything belong to www-data and read/writable:

#cd /var/www
#chown -R www-data:www-data *
#chmod -R 755 *

Now try
http://xxx.xxx.xxx.xxx/install2.php

After the install is finished do following:

# mv install.php install.php_deactivated
# mv install2.php install2.php_deactivated

You should be able to login via http://xxx.xxx.xxx.xxx/ !

How to if I using apache instead lighttpd?
And is it possible to create multi user like torrentflux?

Thanks.